Currently a senior dev and being offered a chance to move into an Engineering Manager position focusing on personnel. Reading the web, it seems that some say 5-7 is the max and others have 30-40 under them, but manage with a lighter touch.
We have a structure of teams of 4-6 (usually a product manager, a QA or two, a dev or two and a technical lead). There are 6 teams at present. The company is keen to keep the high-performing tech leads away from day-to-day personnel management and have them focus on technical guidance and leadership - which is fine. However, it seems a bit daunting to take on board approx 20-30 people with 1:1s, career development planning, pastoral care, calendar management and many other things besides, much of which will be measured for success by senior management using various metrics (some of them intangible, eg. happiness/harmony).
Knowing that the devs like to be left for good chunks of the day to develop and not wanting to over-meeting them at first, my plan is to have 1:1s every fortnight for 15 minutes of focused time, with longer meetings set up where necessary following the 1:1. This roughly means 7-8 hours of 1:1s spread over 10 work days which doesn't seem that onerous to me as a commitment. I realise there will also be preparation/notes post meeting taking up more time, but does that seem feasible or am I being totally naïve here?